If you have a large batch of addresses for which you need coordinates,
GPS Visualizer's Multiple Address Locator is the solution. This form
allows you to geocode an large number of addresses using Yahoo or
Google's Geocoding API service. Your data can be in either a raw,
jumbled, unformatted list, or in a structured table with a header row;
output is plain text but can be plotted on a map or written to a GPX
file.

How is works Google and Yahoo each provide a geocoding "API" -- a way
for other programs to quickly and easily access their services. But
they only allow a certain number of queries per day, based on your IP
address. This form uses JavaScript-On-Demand (JSON) code that causes
your Web browser to be the one making the request (rather than
gpsvisualizer.com), which means your queries don't count against my
server's limit. (And thanks are due to the developers of the batch
geocoder at BatchGeocode.com for the Yahoo JSON info.) Verifying
strange results Sometimes the geocoder returns coordinates that don't
seem right. Unfortunately, there's no way to get Yahoo's precision
information using this form -- but you can see Yahoo's precision
estimate for individual addresses